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Expression search_tag is undefined on line 56,<a href="http://www.inintb.com/" title="www.inintb.com" style="text-decoration: none;font-weight: bold">www.inintb.com</a>, column 67 in tuan/index/details.ftl.The problematic instruction:----------==> if search_tag == all_title [on line 56, column 62 in tuan/index/details.ftl]----------Java backtrace for programmers:----------freemarker.core.InvalidReferenceException: Expression search_tag is undefined on line 56, column 67 in tuan/index/details.ftl.at freemarker.core.TemplateObject.assertNonNull(TemplateObject.java:125)at freemarker.core.ComparisonExpression.isTrue(ComparisonExpression.java:121)at freemarker.core.ConditionalBlock.accept(ConditionalBlock.java:77)at freemarker.core.Environment.visit(Environment.java:221)at freemarker.core.MixedContent.accept(MixedContent.java:92)at freemarker.core.Environment.visit(Environment.java:221)at freemarker.core.Environment.process(Environment.java:199)at freemarker.template.Template.process(Template.java:237)at freemarker.ext.servlet.FreemarkerServlet.process(FreemarkerServlet.java:452)at freemarker.ext.servlet.FreemarkerServlet.doGet(FreemarkerServlet.java:391)at javax.servlet.http.HttpServlet.service(HttpServlet.java:115)at javax.servlet.http.HttpServlet.service(HttpServlet.java:92)at com.caucho.server.dispatch.ServletFilterChain.doFilter(ServletFilterChain.java:106)at com.caucho.server.webapp.DispatchFilterChain.doFilter(DispatchFilterChain.java:115)at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:229)at com.caucho.server.webapp.RequestDispatcherImpl.forward(RequestDispatcherImpl.java:277)at com.caucho.server.webapp.RequestDispatcherImpl.forward(RequestDispatcherImpl.java:106)at org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1063)at org.apache.struts.action.RequestProcessor.processForwardConfig(RequestProcessor.java:386)at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:229)at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1194)at com.netease.tuan.servlet.ActionServletGBK.process(ActionServletGBK.java:16)at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414)at javax.servlet.http.HttpServlet.service(HttpServlet.java:115)at javax.servlet.http.HttpServlet.service(HttpServlet.java:92)at com.caucho.server.dispatch.ServletFilterChain.doFilter(ServletFilterChain.java:106)at com.netease.tuan.filter.CSRFDefendFilter.doFilter(CSRFDefendFilter.java:39)at com.caucho.server.dispatch.FilterFilterChain.doFilter(FilterFilterChain.java:70)at com.netease.tuan.filter.LoginFilter.doFilter(LoginFilter.java:95)at com.caucho.server.dispatch.FilterFilterChain.doFilter(FilterFilterChain.java:70)at com.netease.urs.filter.ParamFilter.doFilter(ParamFilter.java:103)at com.caucho.server.dispatch.FilterFilterChain.doFilter(FilterFilterChain.java:70)at com.netease.tuan.filter.MonitorFilter.doFilter(MonitorFilter.java:24)at com.caucho.server.dispatch.FilterFilterChain.doFilter(FilterFilterChain.java:70)at com.caucho.server.webapp.WebAppFilterChain.doFilter(WebAppFilterChain.java:173)at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:229)at com.caucho.server.hmux.HmuxRequest.handleRequest(HmuxRequest.java:420)at com.caucho.server.port.TcpConnection.run(TcpConnection.java:514)at com.caucho.util.ThreadPool.runTasks(ThreadPool.java:527)at com.caucho.util.ThreadPool.run(ThreadPool.java:449)at java.lang.Thread.run(Thread.java:662)